Maxim Integrated DS3991Z HB

Description
The DS3991 is a controller for cold-cathode fluorescent lamps (CCFLs) used to backlight liquid-crystal displays (LCDs). It is available for both push-pull and half-bridge drive topologies. The DS3991 converts a DC voltage (5V to 24V) to the high-voltage (300VRMS to 1400VRMS) AC waveform required to power CCFLs. The push-pull and half-bridge drive schemes use minimal external components, reducing cost and simplifying PCB design. Both schemes provide efficient DC to AC conversion and produce near-sinusoidal waveforms.

Features
CCFL controller for backlighting LCD panels
Minimal external components required
Lamp fault monitoring for lamp-open, lamp-overcurrent, failure-to-strike, and overvoltage conditions
Accurate (±5%) on-board oscillator for lamp frequency (40kHz to 80kHz)
Accurate (25%) on-board oscillator for DPWM burst-dimming frequency (80Hz to 300Hz)
Device supply undervoltage lockout
Inverter supply undervoltage and overvoltage lockouts
Soft-start on burst-dimming minimizes audible transformer noise
Strike frequency boost
100% to <10% dimming range
Low cost
Single-supply operation range: 4.5V to 5.5V
Temperature range: -40°C to 85°C
16-Pin SO Package (150 mils)

Applications
LCD PC Monitors
LCD TVs